Patients, ranging from cognitively unimpaired to diagnosed dementia, from the University of Southern California Alzheimer's Disease Research Center (ADRC) clinical core were seen for yearly evaluation. Inclusion criteria for this study were age > 70 and having been previously registered and followed in the clinical core. Eligibility for the clinical core includes having a vascular or metabolic risk factor for cognitive impairment or dementia, willingness to donate one's brain upon death, or participation in ADRC‐affiliated studies. In recent years, these eligibility considerations skew clinical core participants toward the cognitively unimpaired to early mild cognitive impairment (MCI) range, tending to not include participants with dementia.
We planned to include 60, English‐speaking participants who underwent telephone‐based neuropsychological evaluation, performed and obtained using the UDS.4 Consent was obtained prior to participants’ annual, remote visit and the T‐cog Neuropsychological Battery. The battery was intended to be repeated approximately 2 weeks after the initial test. One version of the telephone UDS (T‐UDS) was used for both administrations. Two neuropsychological technicians administered the T‐cog, and the same tester administered the first and repeated test to each participant.